Sinus Rhythm & Core Variations · Normal Sinus Rhythm (NSR): The physiological standard. Regular rhythm (60-100 bpm), with a normal P wave preceding each narrow QRS complex. · Sinus Tachycardia: >100 bpm. A normal physiological response to demand (e.g., exercise) or a sign of pathology (e.g., fever, anemia). · Sinus Bradycardia:

🫀 Normal Sinus Rhythm vs. Arrhythmia 🫀 Know the difference. Save a life. 💡 ✅ Normal Sinus Rhythm (NSR) • Heart rate: 60–100 bpm • Origin: SA node • Regular PQRST waves • Steady rhythm = Efficient circulation ⚠️ Arrhythmia • Irregular heartbeat (too fast, too slow, or erratic) • Can originate from atria, AV node, or ventricles • Examples: Atrial fibrillation, ventricular tachycardia, bradycardia • May cause dizziness, palpitations, syncope, or even cardiac arrest 💬 Swipe to see ECG examples (